Tube to Chunnel – Underground Mapping

A session at State of the Map 2013

  • Paul Sladen

Sunday 8th September, 2013

9:30am to 9:50am (GMT)

Paul Sladen
GPS and overhead imagery do not work in tunnels. Harry Beck's Tube map has taught Londoners that trains only travel at multiples of 45 degrees, but railways and pipelines below ground are rarely simple or straight. Despite this, OSM often has greater coverage with accuracy than other available maps! This talk covers how underground surveying can be done, from the hunt for ventilation shafts and escalator entrances, to how the original tunnels were surveyed (horizontally) and levelled (vertically) a century earlier. Before GPS there were theodolites and trigonometry, but modern surveying has the gyrotheodolite and computers. Join us as we venture underground, deep beneath Berlin, Helsinki, London and the Channel Tunnel.

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Paul Sladen

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Time 9:30am9:50am GMT

Date Sun 8th September 2013

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